On common ground about abortion
Short version, there is none. Expanded version, the pro-abortionists want to have the license to kill unborn children. Some of them from Chicago even allow the murder of fully born infants. Pro-lifers hold that a human person is formed at conception. Hence between life and death, there is really no middle or common ground. Pro-aborts will then go for the split the difference argument i.e. to be able to abort in the first trimester but not afterwards. They just don't get that a person, no matter how young, is still a person with the inalienable right to live.